作者:Wannaporn Disadee、Poonsakdi Ploypradith、Thammarat Aree、Narongsak Chaichit、Somsak Ruchirawat
DOI:10.1016/j.tetlet.2011.09.032
日期:2011.11
A novel approach for the syntheses of lophocladines A and B has been developed. These compounds were prepared in 4–6 steps with moderate to excellent overall yields. The key step involved the nucleophilic substitution of 4-chloronicotinic acid with the carbanion generated from phenylacetonitrile. Subsequent reduction of the cyano group, lactamization and oxidation furnished lophocladine A in 50% yield
已经开发了合成lophocladines A和B的新方法。这些化合物分4至6步制备,总收率中等至优异。关键步骤涉及用苯乙腈生成的碳负离子对4-氯烟酸进行亲核取代。随后的氰基还原,内酰胺化和氧化作用在4个步骤中提供了50%的产量的环磷素A。用各种胺进一步胺化得到磷环草定B及其C1类似物,收率高。另外,评估了合成的化合物对白血病细胞的细胞毒性。